/*
 * Copyright (c) 2011 ymnk, JCraft,Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice, this list of
 * conditions and the following disclaimer in the documentation and/or other materials provided with
 * the distribution.
 *
 * 3. The names of the authors may not be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL JCRAFT, INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
/*
 * This program is based on zlib-1.1.3, so all credit should go authors Jean-loup
 * Gailly(jloup@gzip.org) and Mark Adler(madler@alumni.caltech.edu) and contributors of zlib.
 */

package com.jcraft.jsch.jzlib;

final class JZlib {
  private static final String version = "1.1.3";

  static String version() {
    return version;
  }

  static final int MAX_WBITS = 15; // 32K LZ77 window
  static final int DEF_WBITS = MAX_WBITS;

  enum WrapperType {
    NONE, ZLIB, GZIP, ANY
  }

  static final WrapperType W_NONE = WrapperType.NONE;
  static final WrapperType W_ZLIB = WrapperType.ZLIB;
  static final WrapperType W_GZIP = WrapperType.GZIP;
  static final WrapperType W_ANY = WrapperType.ANY;

  // compression levels
  static final int Z_NO_COMPRESSION = 0;
  static final int Z_BEST_SPEED = 1;
  static final int Z_BEST_COMPRESSION = 9;
  static final int Z_DEFAULT_COMPRESSION = (-1);

  // compression strategy
  static final int Z_FILTERED = 1;
  static final int Z_HUFFMAN_ONLY = 2;
  static final int Z_DEFAULT_STRATEGY = 0;

  static final int Z_NO_FLUSH = 0;
  static final int Z_PARTIAL_FLUSH = 1;
  static final int Z_SYNC_FLUSH = 2;
  static final int Z_FULL_FLUSH = 3;
  static final int Z_FINISH = 4;

  static final int Z_OK = 0;
  static final int Z_STREAM_END = 1;
  static final int Z_NEED_DICT = 2;
  static final int Z_ERRNO = -1;
  static final int Z_STREAM_ERROR = -2;
  static final int Z_DATA_ERROR = -3;
  static final int Z_MEM_ERROR = -4;
  static final int Z_BUF_ERROR = -5;
  static final int Z_VERSION_ERROR = -6;

  // The three kinds of block type
  static final byte Z_BINARY = 0;
  static final byte Z_ASCII = 1;
  static final byte Z_UNKNOWN = 2;

  static long adler32_combine(long adler1, long adler2, long len2) {
    return Adler32.combine(adler1, adler2, len2);
  }

  static long crc32_combine(long crc1, long crc2, long len2) {
    return CRC32.combine(crc1, crc2, len2);
  }
}
